Portable surface grinding machine



March I, 1938. E. G. MOFFETT PORTABLE SURFACE GRINDING MACHINE 4Sheets-Sheet 1 Filed May 12, 1937 [dam l1 4 /70/76 A TORNEYS March 1,1938. E. e. MOFFETT PORTABLE SURFACE GRINDING MACHINE Filed May 12,193'? 4 Sheets-Sheet 2 [div/i7 /70 ATTORNEYS March 1, 1938. E. e.MOFFYETT 2,109,827

PORTABLE SURFACE GRINDING MACHINE Filed May 12, 1957 4 Sheets-Sheet 3NVENTOR ATTORNEYS March 1, 1 938. E. s. MOFFETT PORTABLE SURFACEGRINDING MACHINE 4 Sheets-Sheet 4 Filed May 12, 1957 ATTORNEYS PatentedMar. 1, 1938 PATENT OFFICE I PORTABLE SFAClE. GRINDING MACHINE Edwin G.Moffett, Mobile, Ala.

Application'May l2,

3 Claims.

This invention relates to grinders for slide valve seats of steam drivenengines, pumps and other similar devices and has for the primary objectthe provision of a portable and inexpensive device of this characterwhich will rapidly and efliciently reface a slide valve seat of a steamchest or like device without the necessityof disturbing or taking theengine or pump apart and ,which will reduce man power for such work andpermit accurate work to be accomplished and is readily adjustable sothat the device may be adapted to different types and, sizes of chestsand valve seats. Y

With these and other objects in view, this invention consists in certainnovel features of construction, combination and arrangement of parts 'tobe hereinafter more fully described and claimed.

For a complete understanding of my invention, reference is to be had tothe following description and accompanying drawings, in which r Figure 1is a side elevation illustrating a grinder constructed inaccordance'w'ith my invention. Figure 2 is a top plan view partly insection 5 illustrating the device.

' Figure 31s a sectional view taken 3-3 of Figure '1. f'

- Figure 4 is a sectional view taken on the line 4-4 of Figure 3.

Figure 5 is a fragmentary sectional view illustrating a feed mechanismtaken on the line 5--5 of Figure 1. I r

Figure 6 is a fragmentary sectional view illus trating a modified formof my invention.

Referring in detail to the drawings, the numeral i indicates acombinedattaching and supporting frame, including side members 2 eachhaving a right angularly extending base flange 3 equipped with slots 4to receive stud bolts 5 10 for detachably securing the combinedattaching and supporting frame to a steam chest or like device after thecover has been removed for the purpose of exposing the valve seat of thechest on the line and which is indicated by the character 6. The

l5 slots 4 permit the frame I to be adjusted to fit on different sizesof chests.

Each side member is composed of sections A and B hingedly connected, asshown at I, whereby the section A may swing upwardly relative to thesection B. The upper edge of the section B has a groove 8 to receive arib 9 on the section A. The rib 9 and groove 8 act to maintain the.

sections A and B in alignment. The sections 13 rotatably support a shaftIn to which is secured a hand lever II for rotating the shaft in either1937, Serial No. 142,264

direction. Eccentric connections are provided between the shaft l0 andthe sections A for the purpose of raising and lowering the sections Arelative to the sections B and each eccentric connection consists of adisc l2 secured to the shaft 50 and having an eccentrically located slotl3 to receive a pin M secured to the section A.

The side members of the sections A have formed therein slots i5, i6 andH, the walls of which form tracks. Combined rollers and journals l8engage with the tracks formed by the slots I1 and slidably and rotatablyreceive a shaft W on which is secured a bed 20 and mounted on the bed isan electric motor 2! provided with. a handle 22 and power takeoff shaft23. The shaft I9 being slidable transversely of the frame I alsolongitudinally of said frame I permits the electric motor ii to beadjusted or moved both longitudinally and transversely of the frame orthe valve seat 6.

Carriages 23' areslidably mounted on the side members 2 of the. frame Iand each straddles its respective side member'and have journaled thereonrollers 24 'whichtravel upon thetracks defined by the slots I5.Adjustably mounted on the carriages 23" are journals 25 which rotatablyand slidably support a shaft 26. The bed20 has bearings 21 to receivethe shaft 26, the shaft 26 being both slidable and rotatable inthebearings 21. A sleeve 28 is keyed on the shaft 26 and has a portion onwhich is removably mounted a grinding disc or tool i9 and also hasformed thereon a gear 30 which meshes with a gear 3! secured to thepower shaft of the electric motor. The journals 25 being adjustable onthe carriages 23' provide means for adjusting the grinding tool 29towards and from the work and whenever it is desired to elevate thegrinding tool from the work the hand lever II is actuated to raise thesections A from the'sections B of the side members 2.

Braces 32 are secured to thejournals 25 and are rotatably mounted on thecombined rollers and journals l8.

A feed shaft 33 is secured to the motor bed 20 and extends through theslot I6 in one of the side members 2 and also extends through an openingin one of the braces 32. A feed nut 34 is journaled on the last-namedbrace and meshes with the feed shaft 33. A pivotally mounted hand leveris provided with a spring actuated double acting dog 36, eitherend ofwhich may engage with a ratchet gear 31 forming apart of the feed nutwhereby the feed nut may be rotated in either direction for the purposeof sliding the motor 2! and grinding tool 29 transversely of the valveseat 6 in either direction.

From the foregoing description taken in connection with the accompanyingdrawings it will be seen that the grinding tool is advancedlongitudinally of the work or valve seat 6 by the operator grasping thehandle 22 of the motor and sliding the latter longitudinally of theframe i. To adjust the grinding tool transversely of the work cr valveseat the hand lever 35 is actuated. To raise and lower the grinding toolinto operative and inoperative positions with respect to the work the.hand lever H is actuated. To adjust the working position of the grindingtool with respect to the work the journals 25 are adjusted on thecarriages 23. The adjustment of the journals 25 regulates the depth ofcut made by the grinding tool. Further, it will be noted that a deviceof this kind can be easily applied and removed from the work and whenapplied to said work will be held against accidental displacement andmay be readily adapted to work of different kinds and also it is to beunderstood that this device may be employed for refacing any surface ofany device.

Adjustable stops 30 are mounted on the side members 2 of the frame forlimiting the longitudinal movement of the carriages which in turn limitsthe longitudinal adjustment of the grinding device.

Referring to my modified form of invention as shown in Figure 6 theshaft 26 is non-rotatable and non-slidable and the bed of the motor isslidable thereon, also the grinding tool, the latter besides beingslidable is rotatable on the shaft 26. A sleeve 26 is journaled on theshaft 26 and is received in the bearings of the motor vehicle and formsa support for the grinding tool, the latter being detachably secured tothe sleeve.

What is claimed is:

1. A portable grinder comprising a frame; adjustable means for securingthe frame to work, a shaft rotatably and slidably mounted on the frame,a motor bed secured to said shaft, carriages carried by said frame andmovable longitudinally thereof, journals adjustably secured to grease?said carriages, a second shaft journaled in said bearings and having themotor bed journaled thereon, a power means carried by said bed, agrinding device connected to said power means and supported by thesecond shaft, a feed mechanism carried by the frame and connected to thebed for adjusting the latter transversely of the frame, and a handlesecured to the motor for sliding the motor and grinding mechanismlongitudinally of the frame.

2. A portable grinding device comprising an adjustable frame includingside members each composed of separable sections adjustable towards andfrom each other, means for adjusting said sections relative to eachother, carriages slidable on said side members and longitudinallythereof, a grinding mechanism adjustably mounted on said carriages andadjustable transversely of the frame, power means connected to saidgrinding mechanism, a support for said power means, and means mountingsaid support on the frame for adjustment longitudinally and transverselyof said frame and adapted to be adjusted longitudinally by manual powerapplied to said power means, and means manually actuated for adjustingsaid support transversely of the frame.

3. A portable grinding device comprising an adjustable frame includingside members each composed of separable sections adjustable towards andfrom each other, means for adjusting said sections relative to eachother, carriages slidable on said side members and longitudinallythereof, a grinding mechanism adjustably mounted on said carriages andadjustable transversely of the frame, power means connected to saidgrinding mechanism, a support for said power means, means mounting saidsupport on the frame for adjustment longitudinally and transversely ofsaid frame and adapted to be adjusted longitudinally by manual powerapplied to said power means, means manually actuated for adjusting saidsupport transversely of the frame, and adjustable means carried by theframe for limiting the longitudinal adjustment of the grinding mechanismrelative to the frame.

' EDWIN G. MOFFET'I.

